[Pro Sites] PRO SITES - Switching from Monthly to Annual Plan

Current Customer Plan: https://www.screencast.com/t/yzJQ7Y4e

1. I log in to the customer account.
2. Go /register/?bid=183
3. Select Annual Plan View
4. Click on Launch Now
5. Enter credit card details

And... Page just refreshes.

How do we change plan?? Please advise ASAP